export declare class Heartbeat {
    private heartbeatInterval;
    private heartbeatTimeout;
    private _sendPing;
    private _onTimeout;
    private _seenPacket;
    private _heartbeatIntervalHandle;
    private _heartbeatTimeoutHandle;
    constructor(options: any);
    stop(): void;
    start(): void;
    _startHeartbeatIntervalTimer(): void;
    _startHeartbeatTimeoutTimer(): void;
    _clearHeartbeatIntervalTimer(): void;
    _clearHeartbeatTimeoutTimer(): void;
    _heartbeatIntervalFired(): void;
    _heartbeatTimeoutFired(): void;
    messageReceived(): void;
}